Tie Down drum brakes are designed to withstand a marine environment. The Galv-X system is composed of inorganic polymers which bond metallic zinc flakes to the metal surface. The E-Coat drums are painted. Kit includes aluminum wheel cylinder stainless steel spring brake pads that are bonded and riveted with bronze rivets to backing plate and backing. These are enough parts to do one axle. Drum replacement parts kit includes: springs adjuster tool brass hardware and hardware for the backing plate.